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" Sequoia )Chesapeake Drive Redwood City CA 94063 5} 364-9600 FAX(4151 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (514) 988 9673 <br /> 14W Analytical 319 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> *MOON Associates Client Project ID Arco 2130-95-5, Stockton <br /> 1433 N Market Blvd Matrix Air <br /> Sacramento, CA 95834 <br /> Attention Jay Johnson QC Sample Group 5070685-688 Reported Jul 18 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: =r A 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked Z 0 mg/m' 2 0 mg/m3 2 0 mg/m3 6 0 mg/ma <br /> LCS Batch# 1-C-S071895 LCS071895 LCS071895 LCS071895 <br /> Date Prepared: 7/18,95 7/18/95 7/18/95 7/18/95 <br /> Date Analyzed: 7/18'95 7/18/95 7/18/95 7/18/95 <br /> Instrument I D #: GCHP-2 GCHP-2 GCHP 2 GCHP 2 <br /> LCS <br /> Recovery: 96 100 90 86 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #• 2-070783 5070783 5070783 5070783 <br /> Date Prepared: 7/18/95 7/18/95 7/18/95 7/18/95 <br /> Date Analyzed: 7/18/95 7/18/95 7/18/95 7/18/95 <br /> Instrument I D #: 3CHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 90 90 88 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 89 86 87 88 <br /> Relative% <br /> Difference: 1 1 45 11 0 0 <br /> SEQUOIA ANALYTICAL Please Note � <br />. The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> % preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> r �G ' validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5070685 EMC <2> <br />